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<title>Problem 1047. -- [HAOI2007]理想的正方形
</title><center><h2>1047: [HAOI2007]理想的正方形
</h2><span class=green>Time Limit: </span>10 Sec&nbsp;&nbsp;<span class=green>Memory Limit: </span>162 MB<br><span class=green>Submit: </span>520&nbsp;&nbsp;<span class=green>Solved: </span>251<br>[<a href='submitpage.php?id=1047'>Submit</a>][<a href='problemstatus.php?id=1047'>Status</a>][<a href='bbs.php?id=1047'>Discuss</a>]</center><h2>Description</h2><div class=content>有一个a*b的整数组成的矩阵，现请你从中找出一个n*n的正方形区域，使得该区域所有数中的最大值和最小值的差最小。
</div><h2>Input</h2><div class=content>第一行为3个整数，分别表示a,b,n的值
第二行至第a+1行每行为b个非负整数，表示矩阵中相应位置上的数。每行相邻两数之间用一空格分隔。
</div><h2>Output</h2><div class=content>仅一个整数，为a*b矩阵中所有“n*n正方形区域中的最大整数和最小整数的差值”的最小值。
</div><h2>Sample Input</h2>
			<div class=content><span class=sampledata>5 4 2<br />
1 2 5 6<br />
0 17 16 0<br />
16 17 2 1<br />
2 10 2 1<br />
1 2 2 2<br />
</span></div><h2>Sample Output</h2>
			<div class=content><span class=sampledata>1<br />
问题规模<br />
（1）矩阵中的所有数都不超过1,000,000,000<br />
（2）20%的数据2<=a,b<=100,n<=a,n<=b,n<=10<br />
（3）100%的数据2<=a,b<=1000,n<=a,n<=b,n<=100<br />
<br />
</span></div><h2>HINT</h2>
			<div class=content><p></p></div><h2>Source</h2>
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